Here’s an example Verilog code to implement a 4-bit gray code to binary converter circuit:
module gray_to_binary (output reg [3:0] binary, input [3:0] gray);
assign binary[0] = gray[0];
assign binary[1] = gray[1] ^ binary[0];
assign binary[2] = gray[2] ^ binary[1];
assign binary[3] = gray[3] ^ binary[2];
endmodule
This code defines a module called “gray_to_binary” that implements a 4-bit gray code to binary converter. The output “binary” is a registered output that represents the converted binary code. The input “gray” is a 4-bit input that represents the gray code to be converted.
The “assign” statements are combinational logic statements that calculate each bit of the binary code output based on the corresponding bits of the gray input. The binary code output for bit 0 is the same as the gray input for bit 0. For bits 1 to 3, the binary code output is the exclusive OR of the corresponding gray bits and the previous binary bit.
Note that this Verilog code assumes that the “binary” output and the “gray” input are both 4-bit signals. If you want to use different signal widths, you would need to modify the code accordingly. Additionally, this code implements a combinational circuit, which means that the binary code output is updated immediately whenever there is a change in the gray input. If you wanted to implement a registered circuit, you would need to modify the code accordingly.